An Artificial Magnetic Conductor Backed Electrically Large Zero-Phase-Shift Line Grid-Loop Near-Field Antenna

Yunjia Zeng, Zhi Ning Chen, Xianming Qing, Jianming Jin

Research output: Contribution to journalArticle

Abstract

A zero-phase-shift line (ZPSL) grid-loop antenna backed by an artificial magnetic conductor (AMC) is proposed to realize a uniform and strong magnetic field distribution over an electrically large interrogation zone for near-field wireless systems. The grid-loop configuration is able to achieve a uniform magnetic field distribution over an enlarged interrogation zone by enhancing the magnetic field in the central portion of the ZPSL loop. Moreover, an AMC comprised of four-arm spiral unit cells is designed to back the ZPSL grid-loop antenna for a directional field distribution and enhanced magnetic field intensity. The proposed antenna is exemplified as a reader antenna for ultrahigh frequency near-field radio frequency identification systems. By using an Impinj Speedway reader with an output power of 30 dBm, a 100% detection rate of Impinj J41 tags is achieved up to 90 mm over an interrogation zone of 200 × 200 mm2.

Original languageEnglish (US)
Article number7857755
Pages (from-to)1599-1606
Number of pages8
JournalIEEE Transactions on Antennas and Propagation
Volume65
Issue number4
DOIs
StatePublished - Apr 2017

Keywords

  • Artificial magnetic conductor (AMC)
  • grid loop
  • loop antenna
  • near-field antenna
  • radio frequency identification (RFID)
  • ultrahigh frequency (UHF)
  • zero-phase-shift line (ZPSL)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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